"The Traveller's Library [sic.] series name was used first by Longman, Brown, Green, and Longmans (London, UK) for their Traveller's Library series from about 1850-1862. The series consisted of reprints of books on, not surprisingly, travel.
"In 1926, Jonathan Cape reused the name for a series of titles drawn primarily from their back catalog with a general focus on travel and international authors. In 1927 the series began to be published in the US by Jonathan Cape & Harrison Smith. In 1928 William Heinemann Ltd joined Cape to co-publish the series, adding new titles from Heinemann’s back catalog. Cape issued 218 titles in the initial series and an additional 7 titles as part of the New Travellers' Library (in 1950). A few titles, such as e.e. cummings The Enormous Room
, were only published by Cape and Smith in the US. Heinemann also issued unique titles as part of the series. The Travellers' Library is an interesting example of a global collaboration between three publishers issuing titles in one similarly designed and formatted reprint series."
(A Series of Series